Daylight-loading photographic dark slide.



1. DONALD.

DAYLIGHT LOADING PHOTOGRAPHIC DARK SLIDE.

APPLICATION FILED AUG.25. 1914.

Patented Nov. 2, 1915.

4 SHEETS-SHEETI 77/ r/vfs 5551.

COLUMBIA PLANOGRAPH c0..w,\smNGTON D c J. DONALD. DAYLIGHT LOADING PHOTUGRAPHIC DARK SLIDE! APPLICATION FILED AUG.25. |914. 1 1 58,902. Patented Nov. 2, 1915.

4 SHEETS-SHEET 2. 5

MTA/5555 J I. DONALD,

DAYLIGHT LOADING PHOTOGRAPHIC DARK SLIDE.

APPLICATION FILED AUG.25\ 1914.

Patented Nov. 2, 1915. 4 SHEETS-SHEET 3 ir i? il Fig?? J. DONALD.

DAYLIGHT LOADING PHOTOGRAPHIC DARK SLIDE.

APPLICATION men Auazs. 1914.

1,158,902. Patented Nov. 2, 1915.

4 SHEETS-SHEET 4- per c of the envelop or holder is closed at one end and open at the other endV and is provided on the et ges at the open end with two projections or catches c the object of which will be hereinafter explained. rFhe inner part or support (l which, as shoivn, carries tivo' plates or their equivalent7 though it may be arranged to carry'only one, is capable of being pushed into the open end of the outer part or Wrapper c and` is provided at one end with a folded or bent strip f of the same material orn which the outer part or Wrapper is formed, the extremities of said strip being closed or not as desired. A piece of ivoolen lvarn or other suitable material f1 is also preferablf,7 secured in the folded or bent strip so that when the inner part or support d is slid into trie outer part or Wrapper c the folded or bent strip lfand the ivoolen Yarn or other suitable material contact theieivith and overlapping the Vend or" the outer part or Wrapper c constitute a light-tight joint thereby protecting the plate or plates or their equivalent l.)V

from the light. A suitable catch g Which may be in the form of a tab or projection having a small hole or opening 7i is fitted to the end of the stiff or rigid support Z carrying the folded or bent Vstrip f and is for the purpose of securing the inner part or support CZ of the plate envelop or holder in place in the dark slidel Y In order to secure the plates or their equivalent P in position. on the inner part or support (Z the center portion'thereof z' is made of cardboard or other suitable niaterial so as to constitute a central support 1 for the plate or its equivalent P and strips of papei or other suitable material are secured to the central support a' being bent over as sh vvn in 13 to grip the plates P indicated in section in that figure. is shown in Fig. l2, one of the strips j is preferably hingedly secured to the central support z' in such manner that it mayv be partially removed, as indicated in dotted lines, for the purpose of facilitating the ins Jrtion f the plates or their equivalent in place and it is made somewhat longer than the other support j, as indicated at j", being closed at its extremity so that When the plates P are inserted the closed extremity7 grips the plates P and aids in retaining them in position. lf desired,V as shown in Fig. 14, both supports (indicated in dotted lines) .mayv be made removable and closed at both ends so that thejy7 can be pushed into Vplace over the edges of the plates P and the central supporte. lVith this arrangement sinallnotches i2 would be formed on the central support z' next to the folded or bent strip 7' to enable the supports j to be pushed into place. Y

Figs. l5 and lrshoiv a slightly modified construction of inner part or support Z of Yhe envelop orrholder. In this arrangement he inner part or support Z is made from one iece of suitable opaque or non-actinic ma- .eia'l having its edges folded over at j.- To render the inner part or support (Z ready for the reception of the plates or their equivalent it is folded or bent at Z (see dotted line)Y so as to assume the form illustrated in full lines in Fig. 16. The tab g is then secured between the tivo thicknesses ofthe inner part or support by means of an adhesive and the plates can be readil7 inserted and held in place bv the bent over edges y'.

In Figs. 17 and 1S a further modification of the inner part or support (Z is illustrated. rllhis modification is somewhat similar to the construction shown in Figs. l5 and 1G but in place of rbeing constituted of' one piece of material bent or folded at the centei', it is formed of tuo pieces Which are secured together at one end along With the tab g. In this arranoeinent one end of each half of the inner part or support d is made slightly7 longer at m so that it can be folded or tucked in between the two halves as illustinted. By making theend min this `manner it serves to stiften the inner part or support al, the plates or their equivalent P heing held inV place by means of the bent over portions j.

In order that the method of using the plate envelop orholder Vmay be i'eadily'understood l will now describe in'detail .that portion of my invention Which relates to the dark slide.l rlhe frame-Work a of the dark slide Which is made With a rebate or the like n has a projection or catch or its equivalent o at one end which projection or catch engac'es with the tab or projection g of the inner part or support Z of the plate envelop or holder when the Vlatter is placed in position in the frame-Work ai, the arranement beine' such that when the hinged back t of the dark slide is opened and the plate envelop or holder inserted the back can then be closed, the plate envelop or holder being held securel)T in place, the closed end c1 of the outer part or vrapper c of the envelop or holder being soineiviat Alonger than the inner part (Z, projecting a short distance beyond the exterior of the framework a. The interior surface of the hinged bach 7) of the dark slideris made With a sliding shutter n having' tivo projecti ons jfl (see Figs. 9 and l0) which, When thehinged baclr 7) is closed, Contact ivith the proiections or catches e formed on the edges of the outer partici' Wrapper c of the plate envelop or holder. Then it is desired to use the darli slide it is placed in the bach of the camera, in the usual manner. with the sliding` shutter y? closed,r as indicated in Figs. 5 an?L .7.

The sliding shutter j) and the projecting portion c1 of the outer part oi VWrapper .ff of the envelop or holder are then gripped with the finger and thumb and pulled out as far as possible, as indicated in Figs. G and 8, thereby uncovering the plate or its equivalent P ready for exposure. When the exposure is made, the sliding shutter p only, is pushed back again, the projections p1 thereon contacting with the projections e on the outer part or wrapper c ot the plate holder causing it to be pushed back over the plate or its equivalent l) as indicated in Fig. 9, until it once more contacts with the folded or bent strip at the end of the inner part Z which supports the plate or its equivalent P. 1When this operation is completed the plate or its equivalent l) is again protected from the light as indicated in Figs. 5, 7 and l0, and the envelop or holder can be removed from the dark slide, reversed and reinserted preparatory to making the second exposure, when two plates ortheir equivalent are contained in the one envelop or holde. As already mentioned, itl dtsired, each envelop or holder may only carry one plate or its equivalent but in order to lessen the number ot envelops required two are preferably carried.

In order to obviate excessive trictional contact between the envelop or holder and the dark slide when the outer part or wrapper c is pulled out to uncover the plate or its equivalent l), the inner end of the envelop or helder normally rests lightly on a movable projection or pin or its` equivalent f] fitted in the dark slide thereby retaining the envelop or holder out contact with the rabbet or the like n. of the slide. lhen the outer part or wrapper c and the sliding shutter y) of the dart: slide are pulled out to their full extent, as in Figs. 6 and S, the inner part l of the plate envelop or holder is then automatically pressed into contact with the rabbet n of the slide through the medium of the movable projection or pin (l and the means for operating same thereby bringing the plate or its equivalent l) into proper register.

The movable projection or pin Q and the means for operating same are shown clearly in Figs. 7, 7a. S and 8, and, as shown, the. mechanism consists ot the movable projection or pin y which is capable ot partial rotation and is pivotally fitted on a pin Q1 secured to the hinged back D. It has a notch or the like i at its lower end which contacts with a fixed tooth or projection s secured to the hinged back Z) so that when the projection or pin Q is partially rotated it will rise slightly as indicated in Figs. er, 6 and 8, when it contacts with the tooth or projection a thereby pressing the envelop or holder into contact with the rabbet n and at the same time compressing a plate spring s1 or its equivalent fitted behind the projection or catch e. The projection or pin g has a cam or its equivalent t secured to it, said cam having a slot t1 in which works a pin t3 forming part ot a lever or the like t2 which is slidably connected to the hinged back of the dark slide as shown in F ig. 2.

ln order that the shutter 2) may be pulled out to its full extent betere the envelop or holder is raised to bring it into register or in other words to bring it into contact with the rabbet n of the slide, and thereby obviate frictional contact between the shutter p and the envelop or holder, during the opening ot the shutter, the sliding lever 252 is made with a recess t* at its outer end while the shutter p has secured to it one end of a spring tg having, as shown clearly in Figs. 8 and Sa, toes or projections t" and t, the projection t5 being arranged to slide over the lever t2 when the shutter is withdrawn until it enters the recess t* and automatically engages same which operation takes .w

place just before the shutter j) has been pulled out to its full extent, the further small outward movement of the shutter y) thereupon causes the lever t2 to be moved along with the shutter owing to the toe or projection ti engaging the recess t4. The arrangement is such that when the shutter y? is pulled out to its full extent, as indicated in Figs. 2, e, 6 and 8, the projection or pin g, through the movement ot the pin 153 in the slot 251 caused by the movement ot the lever when the shutter p is pulled out, is partially rotated and rises slightly when it conacts with the tixed tooth or projection s, against the action of the plate spring or its equivalent .91. lVhen raised, the projection or pin g presses on the tab or projection y of the plate envelop or holder which is supported on said projection or pin thereby bringing the plate at the inner end of the dark slide into register. A plate spring or its equivalent o is also litted to the outer end of the dark slide and this spring normally occupies the position illustrated at Figs. and 7, so that the envelop or holder at that end is not pressed against the rabbet a ot' the dark slide and the outer part or wrapper c of' the envelop or holder can be readily withdrawn with the shutter 7) wit-hout trictional contact with the rabbet ot the slide until the shutter y; is pulled out to its full extent, whereupon, a pin or projection w fitted on the cross-piece p1 secured to the interior surface ot the shutter y) contacts with the lower surface ot the spring o and A presses same upward thereby raising the outer end of the envelop or holder and bringing the plate or its equivalent p into register as illustrated at Figs. G and 8.

vWhen the shutter y) is closed again after the exposure has been made the inward movement of the shutter through the medium of the lever t2 which is actuated by the toe or projection t5 immediately reverses the direction of movement of the slotted cam or the slide.

its equivalent t and the projection or pin g is lowered, the movement being assisted by the spring s1 Ywhile at the same time the pin or projection lw moves away from the plate spring or its equivalent o and allows same lto resume its normal position so that the plateP with its envelop or holder moves out of frictional contact ywith the rabbet of Under further movement of the shutter p, the projection t Contacts with a pin t7 secured to the back Z) (see Fig. 2) and overrides same, the contacting surfaces being suitably beveled or rounded for this purpose, thereby raising the projection t5 .With this modified construction there is also provided exposure indicating means wherebv the o erator can tell-at a o'lance whether Y the plate or its equivalent has been exposed, such exposure indicating means being automatically operated by the actuation of the shutter of the dark slide in which the envelop or holder is placed or by the actuation of the outer part or wrapper preparatory to making the exposure. This exposure indicating means while only illustrated with reference to the modified construction illustrated at Figs. 19 to 22 can, as will .be readily understood, be applied equally well to the other constructions of plate envelop or holder previously described. Y

ln the construction of plate envelop or holder illustrated in Figs. 19 to 22 the end f of the inner part or support Z is preferably made of wood, grooved or recessed, as shown clearly in 22 and to this end are secured flexible bentstrips of paper, thin cardboard or such like Vfor gripping theV rlhese bentv plates or their equivalent l). strips are closed at their extremities by pieces of wood or other suitable material jl so that whenthe plates Vor their equivalent l) are inserted the closed extremities grip the plates thereby retaining them in position. The central support t' in this arrangement is not attached to the end f but is Vcapable of being removed with the plates P.

The end of the central support a' and the ends of the plates or their equivalent l not in contact with the extremities jl rest against a folded or bent strip of paper, thin cardboard or other suitable material ,1- which is inserted in the groove or recess in the the end f of the inner part or support d and constitutes a light-tight joint between the inner part or support Z and the outer part or wrapper c. las illustrated in F ig. 22 the folded or bent strip of paper, thin cardboard or other suitable material f1 is placed over a central web or the like f2 formed in the groove or recess of the end and having a certain springiness or resiliency constitutes Van efficient light-tight joint between the parts when the outer part or wrapper c is pushed into place. As an additional precaution against the entrance of light, the extremities of the end f to which the strips j are secured, may, if desired, be covered with non-actinic paper or other suitable material as indicated at f3. Only one extremity is shown covered.

@ne arrangement of the exposure indicating means is illustrated in Fig. 19 and consists of a guide piece m1 secured to the exterior of the outer part or wrapper c and having a piece of colored paper or other suitable material fc inserted therein so that a portion thereof is exposed through an opening rabbet n of the framework a is positioned to engage with the paper or other material a outside the opening in the guide x1 as the outer part or wrapper c is being withdrawn preparatory to making an exposure, and detaches same, and its removal will thereafter indicate to the operator that the plate or its equivalent l) has been exposed thereby obviating the likelihood of a double exposure being made. rThe external surface of the outer part or apper @may be colored or marked in such manner that when the tongue or its equivalent m is removed a portion of the wrapper c is clearly visible to the operator through an opening r2 made in the guide piece fel, and forms an additional protection against double exposui-es.

Having now fully described my invention, what l claim and desireto secure by Letters Patent is:- Y

l. A daylight loading photographic dark slide provided with a movable shutter, having combined therewith a plate support, a wrapper for the plate for use in connection with the support and capable of being moved with the shutter, means for holding` and retaining the support in the dark slide, and meansadapted to act automatically with respect to the movements of the shutter for moving the support into and out of register.

2. A daylight loading photographic dark slide provided with a movable shutter, having combined therewith a support for a. sensitized medium, a wrapper for the sensitized medium for use in connection with the support and capable of being moved with the shutter, means for holding and retainfr pin or like projection fromV iso ing the support in the dark slide, and means adapted to act automatically with respect to the movements of the shutter for moving the support into and out et register.

3. fr daylight loading photographic dark slide provided with a sliding shutter, having combined therewith a support for a plurality of sensitized mediums, a wrapper tor the sensitized mediums for use in connection with the support and capable et being moved with the shutter, means for holding and retaining the support in the dark slide, and means adapted to act automatically with respect to the moveme ts oi' the shutter for moving the support into and out oi? register'.

d. fr oaylight load'ng photographic dark slide comprising a framework, a hinged back and a sliding shutter, a support for a sensitized medium, a wrapper for the sensitized medium for use in connection with the support and capable or being moved with the shutter, ancL means on the dark slide and on the sensitized medium support adapted to act automatically with respect to the movements oin the shutter for adjusting` the support so as to permit et the Yfree operation of the dark slide.

5. A daylight loading photographic dark slide provided with a movable shutter, having combined therewith a sensitized medium holder comprising an inner part supporting the sensitized medium and an outer part longer than the sensitized medium, means on the inner part for constituting a lighttight oint between the inner and outer parts,means en the inner part and means on the dark slide adapted to act automatically with respect to the movements or t 1e shutter for moving the inner part supporting the medium into and out or register.

6. A daylight loading photographic darli slide provided with a movable shutter, having combined therewith a sensitized medium holder comprising an inner part supporting the sensitized medium and an outer part longer than the sensitized medium, means on the inner part Jfor constituting a lighttight joint between the inner and outer parts, means on the inner part and means on the dark slide adapted to act automatically' with respect to the movements of the shutter for moving the inner part supporting the medium into and out of register, and eX- posure indicating means on the outer part.

7. A daylight loading photographic dark slide provided with a movable shutter having combined therewith a sensitized medium holder comprisingan inner part supporting the sensitized medium and an outer part longer than the sensitized medium, means on :e obtained for ave .nner pari sauf-.Was

' a i longer i In tire ustent may' 'ne obtained for -i L n i t tive cents each, by addressing 'the the inner part for constituting a light-tight joint between the inner and outer@ parts, means on the inner part and means on the dark slide adapted to act automatically with respect to the movements of the shutter for moving the inner 'part supporting the medium into and out of register, and exposure indicating means on the outer part automatically operated by the operation of the dark slide.

8. L daylight loading photographic dark slide comprising a framework, a hinged back and a sliding shutter; a sensitized medium holder comprising an inner part supporting the sensitized medium and an outer part longer than the sensitized medium, means on the inner part for constituting a light-tight joint between the inner and outer parts, means on the inner part and means on the dark slide adapted to act automatically with respect to the movements of the shutter tor moving the inner part supporting the medium into and out of register.

9. A daylight loading photographic dark slide comprising a framework, a hinged back and a sliding shutter; a sensitized medium holder comprising an inner part supporting the sensitized medium and an outer part longer than the sensitized medium, means on the inner part for constituting a light-tight joint between the inner and outer parts, means on the inner part and means on the dark slide adapted to act automatically with respect to the movements of the shutter for moving the inner part supporting the medium into and out of register, and exposure indicating means on f the outer part.

l0. A daylight loading photographic dark slide comprising a framework, a hinged back and a sliding shutter; a sensitized medium holder comprising an inner part supporting the sensitized medium and an outer part longer than the sensitized medium, means on the inner part for constituting a light-joint between the inner and outer parts, means on the inner part and means on the dark slide adapted to act automatically with respect to the movements of the shutter for moving the inner part supporting the medium into and out of register, and exposure indicating means on the outer part automatically operated by the operation of the dark slide.

In testimony whereof l aiiix my signature in presence of two witnesses.

JAMES DONALD. Witnesses WILLIAM FLEMING, SYDNEY CHAPMAN.

"essing the Commissioner of Patents,

w washington, i?. t.

Gomaissioner er" atents, 

